I have been running Bryce's patched version of Xorg for a while. I still
experience occasional crashes. However, I haven't succeeded in crashing
X by moving my stylus along the screen like a madman (like what I
described earlier).

I found out that I can reliably produce a crash by running the
fingerpaint example of qt4, (apt-get install qt4-demos) and touching the
screen. I have attached a backtrace.

These may be two unrelated bugs since one involves the stylus and the
other involves touch input. Let me know if I should file a second bug
report.

** Attachment added: "gdb-Xorg.txt"
   
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/764700/+attachment/2215581/+files/gdb-Xorg.txt

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https://bugs.launchpad.net/bugs/764700

Title:
  Xorg crashed with SIGABRT in utouch_frame_sync()

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